While logged in to Google Accounts, go to https://code.google.com/apis/console/, if you do not have any project created there at the top open dropdown and click “Create Project …“. Enter some Project Name,Project ID and click “Create” button. Once it’s created select your project.
Next in the left sidebar in “APIs & auth” menu click “API” and enable following APIs
- Geocoding API
- Google Cloud Messaging for Android
- Google Maps Embed API
The easiest way to do this would be to search for each API in the top search box and enable them one by one.
Finally go to Credentials Panel, copy your API Key and enter it in WPJB Google APIs Configuration panel.